Abstract: An oil reservoir chamber, a crank chamber and a valve-operating chamber are provided in an engine body. The oil reservoir chamber and the crank chamber are in communication with each other through a through-hole, and the crank chamber and the valve-operating chamber are in communication with the each other through a one-way valve which is opened upon rising of the pressure in the crank chamber. The valve-operating chamber and the oil reservoir chamber are in communication with each other through an orifice. By utilizing a pressure pulsation in the crank chamber, an oil mist produced in the oil reservoir chamber is circulated from the oil reservoir chamber to the crank chamber, the valve-operating chamber and the oil reservoir chamber. Thus, in any operational attitude of an engine, the lubricating oil can be circulated without use of special oil pump.

Abstract: An oil reservoir chamber, a crank chamber and a valve-operating chamber are provided in an engine body. The oil reservoir chamber and the crank chamber are in communication with each other through a through-hole, and the crank chamber and the valve-operating chamber are in communication with the each other through a one-way valve which is opened upon rising of the pressure in the crank chamber. The valve-operating chamber and the oil reservoir chamber are in communication with each other through an orifice. By utilizing a pressure pulsation in the crank chamber, an oil mist produced in the oil reservoir chamber is circulated from the oil reservoir chamber to the crank chamber, the valve-operating chamber and the oil reservoir chamber. Thus, in any operational attitude of an engine, the lubricating oil can be circulated without use of special oil pump.

Abstract: A 4-cycle engine, includes an engine body, having a piston, a crankshaft and a crank chamber, an independent oil reservoir chamber adjacent the crank chamber, the crankshaft extending into the oil reservoir chamber from the crank chamber, an oil mist generator disposed in the independent oil reservoir chamber and being secured to and driven by the crankshaft, and a valve-operating chamber. Further, the engine includes a first passageway connecting the oil reservoir chamber with the crank chamber to provide oil mist communication therebetween, a second passageway connecting the crank chamber with the valve-operating chamber to provide oil mist communication therebetween, and a third passageway connecting the valve-operating chamber with the independent oil reservoir chamber to provide oil communication therebetween, wherein the three chambers and the three passageways form a lubrication oil feed channel to provide one-way circulation of lubrication oil therethrough.

Abstract: A 4-cycle engine, includes an engine body having a piston, a crankshaft and a crank chamber, an oil reservoir chamber adjacent the crank chamber and independent therefrom, the oil reservoir chamber having an oil mist generator therein drivably connected to the crankshaft, and a valve-operating chamber. Further, a first passageway connects the oil reservoir chamber with the crank chamber to provide oil mist communication therebetween. A second passageway connects the crank chamber with the valve-operating chamber to provide oil mist communication therebetween. Additionally, a third passageway connects the valve-operating chamber with the independent oil reservoir chamber to provide oil communication therebetween, wherein the three chambers and the three passageways form a lubrication oil feed channel to provide one-way circulation of lubrication oil therethrough.

Abstract: A system for lubricating a 4-cycle engine includes a crank chamber having a crank portion of a crankshaft contained therein and storing a lubricating oil therein, a valve operating chamber having a valve-operating device contained therein, wherein the crank chamber and the valve-operating chamber are provided in an engine body. An oil mist producing means is provided in the crank chamber for producing an oil mist from the lubricating oil. The crank chamber and the valve operating chamber are in communication with each other above an oil level of the lubricating oil in the crank chamber through a control valve which is opened upon rising of the pressure in said crank chamber and closed upon reduction of the pressure in said crank chamber. The valve-operating chamber is substantially in communication at its upper portion with the atmosphere, and in communication at its bottom with the crank chamber through an orifice.

Abstract: An oil reservoir chamber, a crank chamber and a valve-operating chamber are provided in an engine body. The oil reservoir chamber and the crank chamber are in communication with each other through a through-hole, and the crank chamber and the valve-operating chamber are in communication with the each other through a one-way valve which is opened upon rising of the pressure in the crank chamber. The valve-operating chamber and the oil reservoir chamber are in communication with each other through an orifice. By utilizing a pressure pulsation in the crank chamber, an oil mist produced in the oil reservoir chamber is circulated from the oil reservoir chamber to the crank chamber, the valve-operating chamber and the oil reservoir chamber. Thus, in any operational attitude of an engine, the lubricating oil can be circulated without use of special oil pump.

Abstract: An antechamber system Diesel engine including an antechamber consisting of a front chamber and a rear chamber and a communication port communicating said antechamber with a main combustion chamber wherein at least one of fuel injection ports of a fuel injection nozzle sprays the fuel in the direction of the communication port. The rear chamber is formed integrally with a cylinder head inside the same while the front chamber is formed on a sleeve member detachably fitted to the cylinder head. If desired, a short axis column-like cavity is defined between the front chamber and the rear chamber.

Abstract: An antechamber system Diesel engine including an antechamber consisting of a front chamber and a rear chamber and a communication port communicating said antechamber with a main combustion chamber wherein at least one of fuel injection ports of a fuel injection nozzle sprays the fuel in the direction of the communication port. The rear chamber is formed integrally with a cylinder head inside the same while the front chamber is formed on a sleeve member detachably fitted to the cylinder head. If desired, a short axis column-like groove is defined between the front chamber and the rear chamber.